Needle Roller Bearings - Ntn-snr.com

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Load Rating and Life NTN 2.4.3 Life adjustment factor for operating conditions a3 The life adjustment factor for operating conditions a3 is used for adjustment(<strong>com</strong>pensation) of the bearing life, where the lubricated bearing condition gets worse and the lubricant deteriorates or foreign matter is included in the bearing, caused by the rotational speed, temperature rise, etc. of the bearing in running. Generally the life adjustment factor in the case of good lubricated bearing condition is a3=1 and, particularly where the lubricated bearing condition is good and other factors for the bearing are normal, a3>1 can be applied to adjustment of the bearing life. However, a3
Load Rating and Life NTN When the oscillation angle 2 is very small, difficulty in forming an oil film on the contact surface of rolling ring to rolling element could result in fretting corrosion. In the case of inner ring oscillation, the critical oscillation angle is expressed in formula (2.9). 360˚ dp Critical oscillation angle ⋯⋯(2.9) Z dpDa cos Where, Z : Number of rolling elements (per row) dp : Pitch circle diameter (PCD) of rolling element Dp: Rolling element diameter e : Contact angle (In the case of outer ring oscillation, the right side denominator is dp + Da cos .) 2.7 Life of bearing with linear motion In the case of bearings with linear motion such as linear ball bearing, linear flat roller bearing, etc., the relationship among axial travel distance, bearing load and load rating can be expressed in formulas (2.10), (2.11). When the rolling elements are balls; L 50 Cr 3 Pr ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2.10) When the rolling elements are rollers; L 100 Cr 10/3 ⋯⋯⋯⋯⋯⋯⋯⋯⋯⋯(2.11) Pr where, L Load rating km CrBasic dynamic load rating N (kgf) PrBearing load N (kgf) Fig.2.4 shows the relationship of Cr/Pr to L. Furthermore, when the travel motion cycle and travel distance remain unchanged, the lifetime of bearing can be determined by formulas (2.12), (2.13). When the rolling elements are balls; Lh 50103 Cr 3 (2.12) 60S Pr When the rolling elements are rollers; Lh 100103 Cr 10/3 (2.13) 60S Pr where, Lh: Travel life h S : Travel distance per minute m/min S =2Ln L : Stroke length m n : Stroke cycle N (kgf) 2.8 Various factors influencing bearing life Bearing life is influenced by not only bearing load and rotational speed but also various factors such as lubricating condition, internal clearance, surface roughness and hardness of raceway, heat-treated structure, misalignment, etc. In using bearings, therefore, these influence factors must be taken into full consideration. Table 2.4 shows the bearing operating conditions as a guideline. (For the detail refer to Commentary" described in Bearing Dimensions Table every each bearing type.) Table 2.4 Guideline of the bearing operating conditions Allowable rotational speed (r/min) Surface roughness of raceway Surface hardness of raceway Misalignment Radial internal clearance See Dimensions Table within 0.2a HRC58 to 64 Note: Refer to Subsection 7.5 for various materials and heat-treated hardness thereof. 1/2000 or less (for radial bearing) Ordinary level (C2, C3, C4) Cr /Pr 10 8 6 5 4 3 2 Ball bearing <strong>Roller</strong> bearing 0.05 0.1 0.2 0.3 0.4 0.6 0.8 1 2 3 4 6 8 10 20 30 40 60 100 L10 3 km Fig. 2.4 Life of bearing with axial motion A-17
Page 1 and 2: For New Technology Network R corpor
Page 3 and 4: Technical Data A-001058 Needle roll
Page 5 and 6: Needle Roller Bearings
Page 7 and 8: DIMENSIONAL DATA CONTENTS Needle Ro
Page 9 and 10: Classification and Characteristics
Page 19: Load Rating and Life NTN Table 2.1
Page 23 and 24: Load Rating and Life NTN 2.10 Radia
Page 25 and 26: Calculation of Bearing Loads NTN (2
Page 27 and 28: Calculation of Bearing Loads NTN 3.
Page 29 and 30: Bearing Accuracy NTN 4. Bearing Acc
Page 31 and 32: A-27 Bearing Accuracy NTN 7 7 8 8 8
Page 33 and 34: Bearing Accuracy NTN Table 4.5 Allo
Page 35 and 36: Bearing Internal Clearance NTN 5.2.
Page 37 and 38: Bearing Fits NTN 6.4 Recommended Fi
Page 39 and 40: Bearing Fits NTN 6.5 Interference C
Page 41 and 42: Shaft Bearing and Fits Housing Desi
Page 43 and 44: Shaft Bearing and Fits Housing Desi
Page 45 and 46: Lubrication NTN Table 8.2 Grease va
Page 47 and 48: Lubrication NTN (4) Circulating lub
Page 49 and 50: Sealing Devices NTN 9. Sealing Devi
Page 51 and 52: Sealing Devices NTN 9.2 Combined se
Page 53 and 54: Bearing Handling NTN 10. Bearing Ha
Page 55 and 56: Bearing Handling NTN the bearing fi
Page 57 and 58: Technical Data NTN 11.2 Bearings wi
Page 59 and 60: Technical Data NTN expressed in the
Page 61 and 62: Bearing Type Symbols and Auxiliary
Page 63 and 64: Needle roller and cage assemblies B
Page 65 and 66: Needle Roller and Cage Assemblies
Page 67 and 68: Needle roller and cage assemblies N
Page 69 and 70: Needle roller and cage assemblies N
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Needle roller and cage assemblies N
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Cage and roller type needle roller
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Needle Roller and Cage Assemblies f
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Needle roller and cage assemblies f
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Drawn Cup Needle Roller Bearings
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Drawn cup needle roller bearings NT
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Drawn cup needle roller bearings se
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Drawn cup needle roller bearings se
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Machined Ring Needle Roller Bearing
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Machined ring needle roller bearing
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Machined-ring needle roller bearing
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Machined Ring Needle Roller Bearing
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Inner Rings
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Inner rings NTN Type IR d 510mm Bou
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Inner rings NTN d 1520mm Boundary d
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Inner rings NTN d 80100mm Boundary
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Inner rings NTN d 170380mm Boundary
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Inner rings NTN Inch series Type MI
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Inner rings NTN d 101.600203.200mm
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Adjustable-Clearance Needle Roller
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Clearance-adjustable needle roller
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Clearance-adjustable needle roller
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Complex Bearings
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Complex bearings NTN Bearing compon
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Complex bearings NTN B-143
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Needle roller bearings with thrust
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Needle roller bearings with angular
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Needle roller bearings with three-p
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Needle roller bearings with double-
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Needle roller bearings with double-
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Roller Followers / Cam Followers
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Roller followers: Yoke-type track r
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Roller followers : Yoke type truck
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Cam followers stud type truck rolle
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Thrust Roller Bearings
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Thrust roller bearings NTN Bearing
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Thrust roller bearings NTN B-209
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Thrust needle roller bearings NTN B
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Thrust needle roller bearings NTN B
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Thrust cylindrical roller bearing N
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COMPONENTS Needle Rollers/Snap Ring
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Needle rollers NTN Application of n
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Needle rollers NTN DW 4.55mm Bounda
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Snap rings NTN For shaft Type WR Be
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Snap rings NTN For housing Type BR
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Snap rings NTN Bearing numbers Boun
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Seals NTN Type G Type GD Type G Typ
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LINEAR BALL BEARINGS: Solid, Drawn
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Linear Ball Bearings NTN Components
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Linear Ball Bearings NTN Components
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Solid type linear ball bearings NTN
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Machined cup linear ball bearings N
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Linear ball bearings, stroke type N
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Machined ring linear ball bearings
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Linear flat rollers NTN Stopper Fig
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Linear flat rollers NTN Type BF Typ
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Linear roller bearings NTN Type RLM
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One-way Clutches Tension Pulleys, B
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One-way clutches NTN Shaft and hous
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One-way clutch miniature type NTN T
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Bottom roller bearings NTN Type FRI
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Bottom roller bearings NTN Type FRI
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Tensioner pulleys for textile machi
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Contents of Appendix Approximate co
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Appendix NTN ˚C-˚F temperature co
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C-5 Appendix NTN Standard ball Hult
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Appendix NTN Unit system Quantity P
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Appendix NTN Viscosity conversion t
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Appendix NTN Ordinary tolerance for
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Appendix NTN High Low Hig
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Appendix NTN H7 H8 H9 H10 H11 H13 J
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